[R] Patterns in histogram

[dbeest]

I’ve been busy making some histograms and I would like to distinguish
different groups. I’ve been doing it like this: 

a <- c(1,1,1,1,2,2,2)
hist(a,breaks=c(0,1,2))
hist(a[3:5],breaks=c(0,1,2),col="red",add=TRUE)

Basically plotting them over each other, I assume there is a better
way…Anyway what I want to do is make them in grayscale which essentially
means giving different groups patterns. I’ve been playing around with
“density” and “angle”

a <- c(1,1,1,1,2,2,2)
hist(a,breaks=c(0,1,2))
hist(a[3:5],breaks=c(0,1,2),add=TRUE,,density=3,angle=9)

Although you can make many different combinations with these I wondered if
there are “patterns” (dots for example) available in the similar fashion as
the colors (col="red" or pattern="dots")

cheers,

Dennis
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